Polarization-Resolved Position-Sensitive Self-Powered Binary Photodetection in Multilayer Janus CrSBr

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Low-symmetry 2D materials are crucial for advanced optoelectronic devices like quantum communication and sensing.
• Polarization-resolved photodetection is key for applications requiring light polarization analysis.

Purpose of the Study:

• To fabricate and characterize an optical polarization-resolving photodetector using multilayer semiconducting CrSBr single crystals.
• To investigate the self-powered photodetection capabilities and polarization-dependent photoresponse of the CrSBr material.

Main Methods:

• Fabrication of a photodetector using multilayer CrSBr single crystals and gold (Au) electrodes.
• Measurement of photoresponsivity, detectivity, and dichroic ratio under 514 nm laser excitation.
• Assessment of device stability under ambient conditions over an extended period.

Main Results:

• Demonstrated self-powered photodetection via Schottky junctions at Au-CrSBr interfaces.
• Achieved a photoresponsivity of ~0.26 mA/W and detectivity of 3.4 × 10^8 Jones.
• Observed a large dichroic ratio of 3.4 for polarization along the a- and b-axes.
• Exhibited excellent stability, retaining >95% photoresponsivity for over five months.

Conclusions:

• CrSBr is a promising material for high-performance, ultralow-powered optical polarization-resolving optoelectronic devices.
• The self-powered nature and stability of CrSBr photodetectors make them suitable for demanding technological applications.
• The unique polarization-dependent photoresponse opens avenues for novel sensing and imaging technologies.